Question about JVC AV-56WP74 56" Rear Projection HDTV-Ready Television

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Double Vision ...w/waves on top/bottom too much green.

I have a JVC I'ART 56" Rear Projection Television (Model AV-56WP74) The Picture HAS WAVES(...)(... turn them on the side) TOWARD THE TOP AND BOTTOM OF THE SCREEN. THAY ARE GREEN. AND THE PICTURE IS DOUBLE, AND BLURY. I HAVE TRIED TO ADJUST THE CONVERGENCE BUT THE COLORS WILL NOT LINE UP AND I STILL HAVE THE WAVES ON TOP/BOTTOM. SURFING THE NET I CAME UP WITH THESE POSSIBLES...1 CHANGE A PICTURE TUB-HOW DO I KNOW WHICH ONE CAUSE THERE ARE 3 RED BLUE GREEN? 2 CHANGE A P.W.BOARD ASSEMBLY-HOW DO I KNOW IF ITS THIS? 3 CHECK SOLDER OR CHANGE THE IC'S ON THE BLACK HEATSKINS AND/OR RESISTORS? 4 PURCHASE A SERVICE MANUAL-HOW WILL THIS HELP? I BOUGHT THIS TV IN 2005 AND AFTER 6-MONTHS I HAD TO REPLACE THE RED PICTURE TUBE AND NOW I AM HAVING THIS PROBLEM WITH MY TV. ANY ADVICE YOU MAY HAVE WILL BE GREATLY APPRECIATED...........THANKS dinotanner@hotmail.com

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1024x768 Normal 0 Convergence


When A REAR PROJECTION TV has coloured outlines or a 3D image the Convergence Circuits most likely need attention.

Replacing the output amplifiers (located within the Convergence IC's) allows the pictures to line up correctly, and no more color outlines.

This is the most common fault in all makes of rear projection TVs.

Some models of TV require major disassembly and considerable shop/manufacturer's support to repair because of their design that causes other power supply or vertical deflection problems. The poorly designed products require a "bench" repair that can typically cost from $350 t0 $700.

Some TVs are designed for on-site repair and have more reliable circuit design that does not usually cause damage to other parts of the TV when convergence chips fail. The ones that usually allow reliable on-site repair are JVC, Samsung and Hitachi.

It is normal to have some resistors in the circuit burn up or increase in value from the heat (from 2.2 ohms to 5 or 10 ohms). These resistors must be replaced with the right value or the chip may fail again.

This is not a simple repair like changing batteries or a fuse. Reading through the other posts shows many that try and end up with bigger problems.

Your JVC uses STK 392-110 IC's. Misinformed people replace the IC's with other "new and improved" IC's, like STK 392-150. These are devices with different characteristics and require different value resistors in the circuit. Replacing with the STK 392-150 will cause overheating of the resistors and a damaged IC.

If you are in Calgary, I can help. If not, get someone that has experience working on your JVC. My website is below with some costs and explanation.

calgaryconvergencerepair.weebly.com/convergence-explanation.html

Good Luck,

Easyab

Posted on Jul 07, 2008

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Double vision on tv with purple and green colors


Hello,

This television set, as well as most rear-projections, is prone to convergence driver problems. There are two large chips (STK392-110's) in the TV that need to be replaced, as well as some resistors that are likely damaged as well. Any competent TV repair shops should be able to repair this TV for 200-300 dollars. It is important to note that if the back of the TV is taken off without the proper prep., the Digital input (DVI) will be disabled permanently.

Hope this helps you...

Dec 30, 2008 | JVC AV-56WP74 56" Rear Projection...

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I have the same tv set and about 4months ago Ihad the IC STK392-110 replaced. I was told that it was the most common problem with proj. tvs. It did solve the probem until last night when I went into the menu to change a audio setting and stupiditely accesed the convergence setting and decided to do an auto adjustment which mesed up my beutiful HD picture. Now I have the red out of alignment ad even after I did a reset and multiple manual adjustmets it is still off at the top and bottom af my screen.

Dec 27, 2008 | JVC AV-56WP74 56" Rear Projection...

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sounds like a solder related issue on the convergence ICs. They are acessed through the front of the TV behind the speaker grille and then remove the small acess panel and you will see the convergence amp board with the two ICs on it.

Oct 26, 2008 | JVC AV-56WP74 56" Rear Projection...

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Check that the 3 output plugs are in the right sockets (Red, Blue, Green) There is usually a felt pen colored mark on a white tape on the plug in wires. The Board sockets are marked Red, Green, Blue.

Easyab

Jun 20, 2008 | JVC AV-56WP74 56" Rear Projection...

2 Answers

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If you do not have hand soldering skills or know how to use a multimeter, I would suggest to replace the whole assembly.
If you know how to solder you can just replace 2 ICs that are mounted on the big black heatsinks and possibly 1 or more resistors.
Click here to find the entire assembly for your TV.
Good Luck.

May 24, 2008 | JVC AV-56WP74 56" Rear Projection...

1 Answer

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If you guys do not have hand soldering skills or know how to use a multimeter, I would suggest to replace the whole assembly.
If you know how to solder you can just replace 2 ICs that are mounted on the big black heatsinks and possibly 1 or more resistors.
Click here to find the entire assembly for your TV.
The link provided is for parts for the AV-56WP74 model ONLY. For the 65 inches; you should contact the vendor and provide the correct model number.
Good Luck.

Apr 22, 2008 | JVC AV-56WP74 56" Rear Projection...

1 Answer

RED AND GREEN DOUBLE AND BLUR PICTURE HELP PLEASE


You have a convergence problem. Components are shorted out and must be replaced. Unless you're a technician, there's really nothing you can do at this point.

C-Dog

Feb 03, 2008 | JVC AV-56WP74 56" Rear Projection...

1 Answer

Double vision On JVC AV-56WP74 56


You have an convergence problem, There are 2 IC's that go bad and a few resisters that can change value. If you flip the board with the Chips inspect the pins for cold solder joints. The IC's can be purchased from matelectronics

Jun 17, 2007 | JVC AV-56WP74 56" Rear Projection...

1 Answer

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You need to replace the convergence IC's. That is the most common issue with any CRT type projection TV.

Apr 06, 2007 | JVC AV-56WP74 56" Rear Projection...

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